KR20060094028A - Sanitary napkin - Google Patents

Abstract

An object of the present invention is to provide a sanitary napkin having a structure in which a vaginal facing area is hardly deformed when adhered to an undergarment, and the vaginal facing area can be tightly attached to the vaginal opening.

The liquid absorbing layer 20 constituting the sanitary napkin 1 has a high rigidity vaginal facing area 25 and a low rigidity side area 26 located on both sides thereof, and a vaginal facing area 25 and a side part. The boundary of the area 26 is a folding boundary 29. When the sanitary napkin 1 is worn, the lateral area 26 is bent downward with the folding boundary 29 as a boundary, so that the vaginal facing area 25 is not largely bent or wrinkled, and the vaginal facing is With the area 25 developed almost flat, it is possible to securely contact the vaginal inlet.

Description

Sanitary Napkin {A SANITARY NAPKIN}

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which looked at the sanitary napkin of 1st Embodiment of this invention from the skin side surface.

FIG. 2 is a perspective plan view mainly showing a liquid absorbing layer of the sanitary napkin of the first embodiment. FIG.

FIG. 3A is a cross-sectional view taken along the line III-III of FIG. 1, and FIG. 3B is a cross-sectional view of the liquid absorbing layer only.

4 is a perspective plan view mainly showing a liquid absorbing layer of a modification of the sanitary napkin of the first embodiment.

FIG. 5 is a toss plane view showing mainly a liquid absorbing layer of a modification of the sanitary napkin of the first embodiment. FIG.

It is a perspective top view which shows the mainly liquid absorption layer of the sanitary napkin of 2nd Embodiment.

It is a perspective top view which shows the mainly liquid absorption layer of the sanitary napkin of 3rd Embodiment.

FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. 7, showing the sanitary napkin of the third embodiment.

It is a perspective top view which shows the mainly liquid absorption layer of the sanitary napkin of 4th Embodiment.

It is a perspective top view which shows the mainly liquid absorption layer of the sanitary napkin of 5th Embodiment.

It is perspective perspective view which shows mainly a liquid absorption layer of the modification of the sanitary napkin of 5th Embodiment.

FIG. 12 is a cross-sectional view taken along the line XII-XII in FIG. 10, showing the sanitary napkin of the fifth embodiment.

It is explanatory drawing which shows the modification at the time of attaching a sanitary napkin to a groin part.

<Description of the symbols for the main parts of the drawings>

1, 1A, 1B: sanitary napkin

11: surface sheet

12: back sheet

13: cushion layer

20: liquid absorbing layer

21: lower layer absorbent core

22: upper absorbent core

23, 23a, 23b: cutouts

23c: start

23d: end

23e: straight part

25: vaginal facing area

26: lateral area

27: front area

28: rear area

30: compression line

31: outer compression

101: sanitary napkin

120: liquid absorbing layer

121: lower layer absorbent core

123: cutout

124: cutout

201: sanitary napkin

220: liquid absorbing layer

221: lower absorbent core

222: upper absorbent core

223: cutout

223a: start

223b: end

223c: straight portion

301: sanitary napkin

320: liquid absorbing layer

321: lower absorbent core

324: low density

401, 401A: sanitary napkin

420: liquid absorbing layer

421: lower absorbent core

423: high density part

425: Vaginal facing area

426: side region

427: front area

428 rear area

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sanitary napkin mounted on a woman's groin area, and more particularly, to a sanitary napkin having a structure in which the vaginal facing area is in close contact with the excretory part when worn with underwear.

The sanitary napkin has a liquid permeable surface sheet appearing on the skin-side surface, a liquid impermeable back sheet appearing on the wear-side surface, and a liquid absorbing layer located between the surface sheet and the back sheet.

When attaching the sanitary napkin, the pressure-sensitive adhesive layer provided on the surface of the back sheet is bonded to the inner surface of the crotch portion of the underwear, the underwear is raised toward the body, and the underwear is worn. Is common.

In the state where the sanitary napkin is mounted on the groin part, it is required to mount the vaginal facing area of a predetermined area located on the longitudinal center line of the sanitary napkin so that it is as wrinkled as possible and faces the vaginal inlet. By facing the vaginal facing area of the sanitary napkin not wrinkled, it is easy to absorb the acupuncture points excreted from the vaginal inlet in the liquid absorbing layer and prevent the acupuncture points from leaking out of the sanitary napkin. On the contrary, if the vaginal facing area cannot be brought into contact with the vaginal inlet well, the adhesion between the skin-side surface of the sanitary napkin and the vaginal inlet is lowered, and acupuncture points easily flow out of the sanitary napkin.

As a sanitary napkin which makes the vaginal facing area adhere to the vaginal inlet easily, what is described in the following patent document 1 and patent document 2 exists.

The sanitary napkin described in Patent Literature 1 is that another absorbent core is provided on an absorbent core of a predetermined area, and the central region including the longitudinal center line is made into a large volume, and this bulky portion faces the vaginal inlet. .

In the sanitary napkin described in Patent Document 2, a compressed line compressed so that the surface sheet and the absorbent core are recessed is formed, and the compressed line is surrounded by the skin-side surface central region. In the central region, a low density liquid guide layer is provided between the absorbent core and the surface sheet. The central region enclosed by the compression line has a raised shape, and this raised portion is placed facing the vaginal inlet.

Next, the sanitary napkin described in Patent Document 3 has a lower layer absorber and an upper layer absorber, the lower layer absorber and the upper layer absorber overlap in the central region, and only the upper layer absorber exists on both sides. When the sanitary napkin is attached to the groin part, both sides tend to be deformed downward, and as a result, the center part tends to protrude toward the vaginal inlet.

[Patent Document 1] Patent Publication No. 2004-89392

[Patent Document 2] Patent Publication No. 2004-73759

[Patent Document 3] Japanese Patent Application Laid-Open No. 2002-238948

In general, the part facing the vaginal opening of the sanitary napkin has a width dimension of about 80 mm in the liquid absorbing layer, whereas the width dimension of the groin area of the human body at the position where the vaginal inlet is located is almost 30 mm even if there are individual differences. It is enough. For this reason, both sides of the liquid absorbing layer are liable to bend or crumple while the sanitary napkin is adhesively fixed to the underwear and the sanitary napkin is raised to the groin along with the underwear. As a result, the vaginal facing area is inclined or deformed. It is easy to move to groin area as it is. For this reason, when the sanitary napkin is attached to the groin part, it is difficult to make the vaginal facing area of the sanitary napkin exactly face the vaginal inlet and make it adhere closely.

The sanitary napkin described in Patent Document 1 has a large volume by overlapping the absorbent core in two layers in the central region, but the upper absorbent core is overlapped in the free state with respect to the lower absorbent core. Between the side regions on both sides, the difference in stiffness of the absorbing layer is not so large. For this reason, when a compressive force acts on both sides from a thigh part in the process of attaching to a groin part, the whole sanitary napkin is easy to deform | transform.

As the sanitary napkin described in Patent Literature 2, since a compressed line surrounding the central region of the liquid absorbing layer is formed, the left and right sides of the sanitary napkin are easily bent using the compressed line as an axis. However, since the compression line is a portion in which the absorbent core and the surface sheet are heated, pressurized, and densified, there is not enough freedom as a bending boundary for easily bending the absorbent core. In addition, since there is no difference in the rigidity of the absorbent core in the central region surrounded by the compression line and the side region outside the compression line, when the pressure from the thigh is applied to both sides, the absorbent core together with the side region together with the side region. It is easy to be compressed and the center area is easy to bend.

Next, the sanitary napkin described in Patent Document 3 has two layers of absorbers in the central region and one layer of absorbers on both sides, but the lower aggregate and the upper absorbent fibers aggregate the fluff pulp and the like. Since it is formed by, the difference in stiffness of the absorber in the center region and the side region is not very large. For this reason, it is easy to deform | transform so that the whole may be curved in a groin part, and it is difficult to mount a center area | region in planar shape, and to face a vaginal entrance.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and, when attached to the groin area, a sanitary napkin having a structure which is easy to face the vaginal inlet in the state where the vaginal facing area is not inclined or bent well and the vaginal facing area is developed It aims to provide.

1st this invention is a sanitary napkin which has a liquid permeable surface sheet, a back sheet, and the liquid absorption layer located between the said surface sheet and a back sheet,

The liquid absorbing layer is provided with a vaginal facing area of a predetermined area located on a longitudinal center line, and side regions located on both left and right sides of the vaginal facing area,

The liquid absorbing layer has a thickness dimension of the vaginal facing area larger than that of the side area, and a bending rigidity of the vaginal facing area is set higher than that of the side area.

The boundary between the vaginal facing area and the side area is a folding boundary.

Since the sanitary napkin of the present invention has a large volume of the vaginal facing area of the liquid absorbing layer, the sanitary napkin tends to be in close contact with the vaginal inlet in the vaginal facing area of the liquid absorbing layer.

In addition, since the bending rigidity of the vaginal facing area is higher than that of the side area, and there is a stiffness difference between the vaginal facing area and the side area, the side area is easily bent at the folding boundary as a boundary. For this reason, the high stiffness of the vaginal facing area is not largely bent or wrinkled, and it is easy to face the vaginal inlet in the state where the vaginal facing area is developed, and the adhesion between the vaginal facing area and the vaginal inlet is easy to be increased. Moreover, the side region bent at the boundary of the folding boundary easily adheres from the groin to the thigh, and it is easy to capture the acupuncture points to leak out in the transverse direction of the sanitary napkin in the side region of the liquid absorbing layer.

In the present invention, the liquid absorbing layer has a lower absorbent core and an upper absorbent core having a smaller area than the lower absorbent core, and an upper absorbent core overlaps and is fixed to the skin side surface of the lower absorbent core in the vaginal facing area, and the side region is fixed. It is preferable that the said lower layer absorption core is located in.

For example, the upper absorbent core and the lower absorbent core may be adhesively fixed, and a compression unit that compresses the upper absorbent core and the lower absorbent core together is provided on both sides of the upper absorbent core, and the upper absorbent is absorbed by the compressed unit. The core and the lower absorbent core may be fixed to each other.

In the above invention, since the lower absorbent core and the upper absorbent core are fixed and integrated, the bending rigidity of the vaginal facing area can be increased, and the stiffness difference between the vaginal facing area and the side area can be increased.

It is preferable that the lower absorbent core and the upper absorbent core of the present invention are formed of an absorbent sheet to which hydrophilic fibers are bonded by a binder.

Since the absorbent sheet to which the hydrophilic fibers are bonded with a binder has its own high bending rigidity, the lower absorbent core and the upper absorbent core overlap each other, and preferably the vaginal facing area fixed to each other and the side region formed of the lower absorbent core. The stiffness difference can be increased, and the side region is easily bent around the folding boundary.

In addition, the present invention, the liquid absorbing layer has a lower absorbent core and an upper absorbent core having a smaller area than the lower absorbent core, the upper absorbent core overlaps the skin side surface of the lower absorbent core in the vaginal facing area, the side portion The lower layer absorbent core is located in an area, and in the vaginal facing area, the lower absorbent core can be configured as having a plurality of high-density parts partially compressed.

In this case, the unit weight of the lower absorbent core in the vaginal facing region is greater than the unit weight of the lower absorbent core in the side region, and the density of the lower absorbent core in the vaginal facing region is It is preferred to be higher than the density.

As described above, the invention for forming a high density portion in the vaginal facing area is effective when using an absorbent core formed from a pulp layer that is not bonded to each other.

Further, the liquid absorbing layer has a front region and a rear region located forward and rearward than the vaginal facing region and both side regions, and the bending strength of the lower absorbent core is set higher than the side region in the front region and the rear region. It can be configured as being.

If the stiffness of the vaginal facing area and the anterior and posterior areas is increased, the side areas located on both the left and right sides of the vaginal facing area are deformed preferentially. It becomes easy to attach to.

In the present invention, the difference in the Gurley stiffness value between the vaginal facing area and the side area is preferably 1.96 mN (200 mgf) or more, and more preferably 2.94 mN (300 mgf) or more.

2nd this invention is a sanitary napkin which has a liquid permeable surface sheet, a back sheet, and the liquid absorbing layer located between the said surface sheet and a back sheet,

The liquid absorbing layer is provided with a vaginal facing area of a predetermined area located on a longitudinal center line, and side regions located on both left and right sides of the vaginal facing area,

The liquid absorbing layer has an absorbent core, and the boundary between the vaginal facing area and the side area is a folding boundary,

The folded boundary portion is provided with a cutout portion that penetrates the absorbent core in the thickness direction or penetrates halfway, or a low density portion that partially reduces the density of the absorbent core.

A cutout portion in the present specification is a cut line extending in a straight line, a cut line such as a broken line, or a small hole such as a circular cross section punched through the absorbent core, and the like. It means the penetration part.

According to the second aspect of the present invention, the cutout portion or the low density portion is formed in the absorbent core constituting the liquid absorbing layer as the folding boundary, so that the side region is easily bent around the folding boundary.

For example, the folding boundary is located on both left and right sides of the longitudinal center line and is formed parallel to the longitudinal center line. Alternatively, the folded boundary is formed along the curved shape located on both the left and right sides of the longitudinal center line and directed toward the protruding side on the longitudinal center line.

In the second aspect of the present invention, the absorbent core is preferably formed of an absorbent sheet to which hydrophilic fibers are bonded by a binder.

Since the absorbent sheet has its own high bending rigidity, when the sanitary napkin is pressurized from the transverse direction, the absorbent core itself is not deformed well, and the absorbent core tends to bend around the folding boundary.

Also in the second aspect of the present invention, in the vaginal facing area, the upper absorbent core having a smaller area than the absorbent core can be superposed on the skin-side surface of the absorbent core.

Also in this case, the bending rigidity of the vaginal facing area can be improved by fixing the upper absorbent core on the absorbent core by the bonding or compressing portion.

In the first invention and the second invention, both the cutout portion penetrating the lower absorbent core in the thickness direction or penetrating to the middle, or the low density portion partially lowering the density of the lower absorbent core in the side region. It can comprise as what is formed in.

By providing the cutout portion or the low density portion, the liquid absorbing layer becomes soft in the side region, and when the sanitary napkin receives a force from the side, the side region is flexibly deformed, and it is easy to come into contact with the groin and thigh. In addition, the deformation force does not reach the vaginal facing area well.

In the first and second inventions, it is preferable that a lower density cushion layer is interposed than the absorbent core between the liquid absorbing layer and the surface sheet.

With this configuration, even when the bending strength of the liquid absorbing layer is high in the vaginal facing area, the cushioning layer makes contact with the crotch portion, whereby the feeling of wearing can be improved.

Further, in the first and second inventions, there is provided a compression section compressed concave from the surface sheet, which compression section is located on the left and right sides of the longitudinal center line and extends in the longitudinal direction, and the folding boundary is the compression section. It can comprise as arrange | positioned inside a part.

In this configuration, the folding boundary is positioned in the middle of the edge of the high quality stiffness facing region and the compression portion having the high rigidity located next to the stiffness, and the liquid absorbing layer is formed at the portion of the folding boundary which is fitted to the high rigid portion at both sides. It becomes easy to bend.

However, the compression part compressed in concave shape from the said surface sheet | seat is provided, This compression part is located in the left and right sides of a longitudinal center line, and is extended in a longitudinal direction, and the said folded boundary part is arrange | positioned outward rather than the said compression part, It is possible.

BRIEF DESCRIPTION OF THE DRAWINGS The sanitary napkin of 1st Embodiment of this invention is a top view which looked at the sanitary napkin from the skin side surface, and FIG. 2 is a perspective view which shows the mainly liquid absorbing layer of the sanitary napkin shown in FIG. 3: (A) is sectional drawing which cut | disconnected the sanitary napkin of FIG. 1 taken along the line III-III, and FIG. 3 (B) is sectional drawing which shows the liquid absorbing layer of a sanitary napkin. 4 and 5 show a modification of the first embodiment, respectively, and are a perspective plan view corresponding to FIG. 2.

Below, the surface which faces a body among the two surfaces of each element which comprises the sanitary napkin 1 is called "skin side surface", and the opposite surface is called "wearing side surface." In addition, the longitudinal direction of a sanitary napkin is called "length direction", and the direction orthogonal to the said longitudinal direction is called "width direction." Unless otherwise specified, the dimension of each element is called the "length dimension", and the dimension measured in the said width direction is called the "width dimension." In addition, "inner side" means the side which approaches the longitudinal center line (Oy), and "outer side" means the side which is farther from the longitudinal center line (Oy).

As shown in Fig. 1, the sanitary napkin 1 has a curved rear edge 3 in the same way as the curved front edge 2, and the front edge on the longitudinal center line Oy. The length dimension from (2) to the rear edge part 3 is a longitudinal length shape of about 180-450 mm. Retracting flap portions 4 and 4 are formed on the left and right sides of the sanitary napkin 1 to protrude in the width direction. The front side edge portions 5 and 5 are formed in front of the back flap portion 4, and the rear side edge portions 6 and 6 are formed behind the back flap portions 4 and 4. The sanitary napkin 1 shown in FIG. 1 is located slightly forward than the position where the refold flap portions 4 and 4 divide the longitudinal length dimension of the sanitary napkin 1 into two parts, and the front side edge portion is disposed. (5, 5) is slightly shorter than the back side edge parts (6, 6).

As shown in FIG. 3, the components of the sanitary napkin 1 include a liquid permeable surface sheet 11 appearing on the skin side surface, a liquid impermeable back sheet 12 appearing on the wear side surface, and The absorbent layer 20 is located between the front sheet 11 and the back sheet 12. In addition, a cushion layer 13 having a lower fiber density than the liquid absorbing layer 20 is interposed between the surface sheet 11 and the liquid absorbing layer 20.

A plurality of pressure-sensitive adhesive layers 14 are provided on the wear-side surface of the back sheet 12. The pressure-sensitive adhesive layer 14 is formed in a band-like pattern extending in the longitudinal direction and extends in parallel with the longitudinal center line Oy and is located below the region where the liquid absorbing layer 20 is provided. Also in the return flap part 4, the pressure-sensitive adhesive layer 15 for flaps is provided in the wearable side surface of the back sheet 12. As shown in FIG. The flap pressure sensitive adhesive layer 15 is formed in a rectangular pattern.

When the sanitary napkin 1 is mounted on the human body, the pressure-sensitive adhesive layer 14 is adhesively fixed to the inner surface of the crotch portion of the underwear. In addition, the refold flap portion 4 is folded back to the underwear outer surface with the side edge portion of the crotch portion of the undergarment interposed therebetween, and the refold flap portion 4 is formed by the pressure-sensitive adhesive layer 15 for flaps of the undergarment. It is adhesively fixed to the outer surface of the crotch part.

The liquid absorbing layer 20 is composed of a lower absorbent core 21 and an upper absorbent core 22. The lower absorbent core 21 is smaller than the outer shape of the sanitary napkin 1. As shown in FIG. 1 and FIG. 2, the lower absorbent core 21 has a protruding curved front end portion 21a and a rear end portion 21b. The front end part 21a is located inward of the front edge part 2 of the sanitary napkin 1, and the rear end part 21b is located in front of the back edge part 3 of the sanitary napkin 1 inside. . The side ends 21c and 21c of the lower absorbent core 21 are linear in parallel with the longitudinal center line Oy. Both side ends 21c and 21c of the lower absorbent core 21 are located inward of the front side edge portions 5 and 5 and the rear side edge portions 6 and 6 of the sanitary napkin 1.

The front sheet 11 and the back sheet 12 have the same shape as the outer shape of the sanitary napkin 1, and the front end portion 21a, the rear end portion 21b and the side end portions 21c and 21c of the lower absorbent core 21. The front sheet 11 and the back sheet 12 are adhesively bonded to the outside of the sheet by a hot melt adhesive or the like.

The upper absorbent core 22 is formed with a smaller area than the lower absorbent core 21. As shown in Figs. 1 and 2, the upper absorbent core 22 is rectangular, and has a straight front end 22a and a rear end 22b, and similarly straight side ends 22c and 22c. . The side ends 22c and 22c are located in parallel with the longitudinal center line Oy.

The length dimension L of the upper absorbent core 22 is for example in the range of 60 to 140 mm and the width dimension W is for example in the range of 15 to 40 mm.

In the liquid absorbing layer 20, the region where the upper absorbent core 22 overlaps the lower absorbent core 21 (area of L × W) is the vaginal facing region 25. In the liquid absorbing layer 20, the regions sandwiched between the side end portions 22c of the upper absorbent core 22 and the side end portions 21c of the lower absorbent core 21 are side regions 26 and 26. In addition, the area | region located in front outer side rather than the front end part 22a of the upper layer absorption core 22 is the liquid absorption layer 20, and is rear outer side rather than the rear end part 22b of the upper layer absorption core 22. As shown in FIG. The region located at is the rear region 28. In this embodiment, the side region 26, the front region 27, and the rear region 28 are formed only of the lower absorbent core 21. As shown in FIG.

The lower absorbent core 21 and the upper absorbent core 22 are absorbent sheets to which hydrophilic fibers are bonded by a binder. The absorbent sheet is an airlaid pulp composed of pulverized pulp, a binder such as superabsorbent polymer (SAP) and an ethylene vinyl acetate copolymer, and has a mass ratio of pulp of 50 to 80%, a mass ratio of SAP of 10 to 40%, and a binder The mass ratio of is 5 to 20%. The absorbent sheet is formed by laminating pulverized pulp by an airlaid method to form a fibrous web, spraying SAP on the fibrous web, spray spreading the binder, and heating and pressing.

The unit weight of the lower absorbent core 21 is in the range of 80 to 400 g / m ² , and the unit weight of the upper absorbent core 22 is preferably in the range of 80 to 200 g / m ² , but is not limited thereto. . In addition, each of the lower absorbent core 21 and the upper absorbent core 22 may be formed of one layer of the absorbent sheet. It may be bonded together by a melt adhesive. Moreover, in the range which can exhibit predetermined | prescribed bending rigidity, the said hydrophilic fiber layer which does not contain a binder, for example, the pulverized pulp layer may be superimposed on the said absorbent sheet.

The lower layer absorbent core 21 and the upper layer absorbent core 22 are bonded and integrated through a hot melt adhesive applied in an amount that does not interfere with the permeation of the liquid. In the vaginal facing area 25, since the lower absorbent core 21, which is an airlaid pulp, and the upper absorbent core 22 are bonded and integrated, the bending rigidity in the vaginal facing area 25 is the side region 26, the front. It is higher than the area | region 27 and the back area | region 28, respectively.

The Gurley stiffness in the vaginal facing area 25 in which the lower absorbent core 21 and the upper absorbent core 22 are integrated is preferably 3.92 mN (400 mgf) or more. The difference between the Gurley stiffness of the vaginal facing area 25 and the Gurley stiffness of the side area 26 formed solely of the lower absorbent core 21 is preferably 1.96 mN (200 mgf) or more, more preferably 2.94 mN. (300 mgf) or more. The lower limit of the Gurley stiffness value in the side region 26 is not particularly limited, but is preferably about 0.392 mN (40 mgf).

When the stiffness value is set in the above range, the stiffness difference between the vaginal facing area 25 and the side area 26 causes the vicinity of the side end part 22c of the upper absorbent core 22 (slightly outside of the side end part 22c). It becomes the folding boundary part 29, and the side area | region 26 becomes easy to bend around the folding boundary part 29 as a boundary.

Moreover, in this embodiment, the cutout part (through part) 23 is formed in the lower absorbent core 21 in the said folding boundary part 29. As shown in FIG. As shown in FIG. 3B, the cutout 23 is formed by cutting the lower absorbent core 21 back and forth. As shown in Fig. 2, the cutouts 23 are short in the longitudinal direction, and the cutouts 23 are arranged in a straight line at intervals in the longitudinal direction, and are formed in a cut line (dashed line). .

As shown in FIG. 2, the notch part 23 is formed over the substantially full length of the side end part 22c in the position slightly away from the side end part 22c of the upper layer absorbent core 22 in the width direction outer side. . By forming this cutout 23, the side region 26 is more likely to be bent around the folded boundary 29. That is, in this embodiment, the side region 26 borders the folding boundary 29 due to the stiffness difference between the vaginal facing area 25 and the side area 26 and the presence of the cutout 23. It becomes easy to bend.

In addition, since the vaginal facing area 25 is composed of the lower absorbent core 21 and the upper absorbent core 22, and the bending rigidity is increased, a force acts from the side to the sanitary napkin 1, and the side region ( Even if 26 is bent around the folded boundary 29, the vaginal facing area 25 is not easily bent, and the vaginal facing area 25 is easily attached to the groin area while keeping the flat state as flat as possible.

In addition, the cutout portion 23 formed at the folded boundary 29 does not need to be provided over the entire length of the side end portion 22c of the upper absorbent core 22, and the cutout portion 23 has a range in which the cutout portion 23 is formed. It may be shorter than the side ends 22c. The notch 23 is not a cut line (dashed line) but may be a continuous line extending continuously in the longitudinal direction.

In addition, the notch 23 may not cut through the lower layer absorbent core 21 back and forth, and may be cut to the middle of the thickness of the lower layer absorbent core 21. In addition, the notch 23 does not need to be linear, for example, by punching the lower absorbent core 21 with a needle or the like, a small hole such as a circular cross section is formed through the lower absorbent core 21 or the lower layer. It may be formed to the middle of the thickness of the absorbent core 21.

Alternatively, in the folding boundary 29, a region where the internal density of the lower absorbent core 21 is lowered may be formed along the side end portion 22c of the upper absorbent core 22. This low density state can be formed by applying a local tensile stress to the lower absorbent core 21 in the width direction.

In addition, in the first embodiment, the cutouts 23 are formed in addition to the stiffness difference between the vaginal facing area 25 and the side areas 26, so that the side areas 26 border the folded boundary 29. The present invention is not limited to this embodiment, but the difference in the Gurley stiffness value between the vaginal facing area 25 and the side area 26 is 1.96 mN (200 mgf) or more, more preferably. Is set to 2.94 mN (300 mgf) or more, the side region 26 is easily bent around the folding boundary 29 even when the cutout 23 is not provided. In addition, when the notch 23 is formed, the side region 26 borders the folding boundary 29 even if the difference in the Gurley stiffness value between the vaginal facing area 25 and the side region 26 is smaller than the above range. It becomes easy to bend.

The sanitary napkin 1 is provided with the compression line 30 which appears on the skin side surface. As shown in FIG. 1, the compression line 30 includes an outer compression line 31 surrounding a region where the lower absorbent core 21 is provided in a wide vertical length, and a front end portion of the upper absorbent core 22. (22a) A front inner compression line 32 formed in a protruding pattern in the vicinity from the front, and a rear inner compression line 33 formed in a protruding pattern in the vicinity of the rear end 22b of the upper absorbent core 22 toward the rear. ) In this embodiment, the compression line 30 is formed in the position which does not overlap with the upper absorbent core 22.

As shown in FIG. 3, the compression line 30 is formed by heating and compressing the surface sheet 11, the cushion layer 13, and the lower absorbent core 21 from the skin side surface of the sanitary napkin 1. . The compression line 30 has a groove shape recessed from the skin side surface toward the wearer side, and the lower absorption core 21 is compressed in the compression line 30 than other portions. The cushion layer 13 may have an area covering at least the upper absorbent core 22 and may not necessarily extend to the position of the compression line 30.

As shown in FIG. 2, the cutout 23 formed in the lower absorbent core 22 is formed in an area sandwiched between the side end portion 22c of the upper absorbent core 22 and the outer compression line 31. . The cutout portion 23 is sandwiched between the vaginal facing area 25 having a high rigidity and the outer compression line 31 which has been compressed to increase the rigidity, thereby bending the liquid absorbing layer 20 around the cutout portion 23. It becomes easy to be.

As shown in FIG. 1, at the midpoint between the front inner compression line 32 and the rear inner compression line 33, the interval between the outer compression lines 31 and 31 is narrowest. An imaginary line extending in the width direction passing through the narrowest portion of the outer compression line 31 is shown as the lateral reference line Ox. The lateral reference line Ox coincides with an almost midpoint of the length dimension L of the upper absorbent core 22. The wearer mounts the sanitary napkin 1 on the basis of the pattern shape of the compression line 30 so that the vicinity of the intersection of the transverse reference line Ox and the longitudinal center line Oy coincides as far as possible with the center of the vaginal inlet. Done.

The surface sheet 11 constituting the sanitary napkin 1 is a breathable nonwoven fabric having a unit weight of about 10 to 50 g / m ² . The fiber constituting the breathable nonwoven fabric has a core portion of polyethylene terephthalate resin, a sheath portion of a sheath type composite synthetic fiber, and an inorganic filler such as titanium oxide mixed in the core portion. The surface sheet 11 may be formed of another material as long as it is liquid permeable. For example, a point bond nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, or the like is used. Alternatively, it may be formed of a resin film in which a plurality of liquid permeation holes are formed.

The back sheet 12 is a film such as polyethylene resin, and preferably a moisture-permeable one is used.

As the cushion layer 13, a breathable nonwoven fabric is used. For example, the core portion polyester will add cis Jiro be polypropylene formed of a core-sheath type composite synthetic fibers of eccentric type polyethylene resin, the cushion layer 13 is folded to a weight per unit area of the overlap to the 20 g / m ² around the air-permeable non-woven fabric 4 Used. Alternatively, the cushion layer 13 may be provided with a ground pulp layer wrapped with tissue under the breathable nonwoven fabric, and the cushion layer 13 may be formed only with the ground pulp layer.

In the vaginal facing area 25 having a high rigidity, since the cushion layer 13 is disposed on the surface of the upper absorbent core 22, the feeling of attachment when the vaginal facing area 25 contacts the vaginal inlet becomes good.

FIG. 13: is explanatory drawing explaining an example of the operation | movement which attaches the sanitary napkin 1. FIG. 13 shows the groin 41 and the thigh 42 where the vaginal inlet is located in the female body. In addition, the sanitary napkin 1 is fixed to the crotch portion of the underwear, but is attached to the body. In FIG. 13, only the deformed state of the sanitary napkin 1 in the state fixed to the underwear is omitted in FIG. 13. .

When using the sanitary napkin 1, the pressure-sensitive adhesive layer 14 provided on the wear-side surface is bonded to the inner surface of the crotch portion of the underwear. Further, the back flap portion 4 is folded back from the side edges of the crotch portion of the underwear toward the outer surface, and the flap pressure-sensitive adhesive layer 15 provided on the flap side of the back flap portion 4 is crocheted. To the outside of the Normally, the sanitary napkin 1 is positioned and fixed to the underwear in a state where the leg of the body is inserted into the leg opening of the underwear.

When the underwear is lifted toward the groin portion 41 of the body, in the state (i) in the mounting diagram shown in FIG. 13, a force from the thigh to the side region 26 of the liquid absorbing layer 20 is given from the transverse direction. . Alternatively, a force that pulls up to the center of the crotch portion of the underwear acts. For this reason, the sanitary napkin 1 is going to deform so that a longitudinal center line Oy part may protrude toward the groin part 41.

However, the liquid absorbing layer 20 has a high rigidity of the vaginal facing area 25, and the side regions 26 tend to bend at the folding boundary 29. For this reason, in the state (i) during mounting, the side region 26 is bent by an external force, and the stiffness facing region 25 with high rigidity is not excessively deformed, and the groin portion (maintaining an almost flat development state) It becomes easy to move toward 41).

In the mounted state (ii) shown in FIG. 13, the sanitary napkin 1 is in the vaginal facing area 25 because the vaginal facing area 25 is in contact with the vaginal inlet while not being rolled up or deformed. It becomes easy to be in close contact with an entrance. Since adhesiveness becomes high, acupuncture points are reliably absorbed by the liquid absorbing layer 20 by the liquid suction force of the upper absorbent core 22 via the cushion layer 13. In addition, in the mounting state (ii), since the side region 26 is bent freely around the folding boundary 29, the side region 26 is likely to be in close contact with the groin 41 or the thigh 42. Also, the menstrual blood to flow laterally can be reliably absorbed by the lower absorbent core 21 located in the side region 26, so that it is easy to prevent side leakage.

Modifications and other embodiments of the sanitary napkin will be described below. Hereinafter, the structure and shape part which are substantially the same as the said sanitary napkin 1 are attached | subjected with the same code | symbol as the sanitary napkin 1, and the description is abbreviate | omitted.

The sanitary napkin 1A shown in FIG. 4 and the sanitary napkin 1B shown in FIG. 5 are modifications of the sanitary napkin 1 of 1st Embodiment.

In the sanitary napkins 1A and 1B and the sanitary napkin 1, only the pattern shape of the cutout formed in the lower absorbent core 21 is different, and the shape and structure of the other elements are the same as the sanitary napkin 1 Do.

In the sanitary napkin 1A shown in FIG. 4, the notch 23a formed in the lower absorbent core 21 is formed in the length beyond the length range of the side end part 22c of the upper absorbent core 22. As shown in FIG. The cutouts 23a are located on both the left and right sides of the longitudinal center line Oy, and extend in parallel to the longitudinal centerline Oy, and the cutouts 23a extend from the front end 21a of the lower absorbent core 21. The rear end 21b is formed over the entire length of the lower absorbent core 21. In addition, part of the notch 23a passes through the region between the side end portion 22c of the upper absorbent core 22 and the outer compression line 31.

In this sanitary napkin 1A, at the portion sandwiched between the cutout portion 23a and the side end portion 21c, the lower boundary absorbent core 21 has a folded boundary portion 29 having the cutout portion 23a over its entire length. It becomes easy to bend as a boundary.

In addition, both ends of the cutout 23a do not extend to the front end 21a and the rear end 21b of the lower absorbent core 21, and the end of the cutout 23a is the front end of the upper absorbent core 22. Located in the middle of the portion 22a and the front end portion 21a of the lower absorbent core 21 and in the middle of the rear end portion 22b of the upper absorbent core 22 and the rear end 21b of the lower absorbent core 21. It may be.

In the sanitary napkin 1B shown in FIG. 5, the notch 23b formed in the lower absorbent core 21 is arrange | positioned at the both left and right sides of a longitudinal center line, and each notch 23b is a starting end. 23c and the end 23c are located in the side end part 21c of the lower absorbent core 21, and the intermediate part is formed so that it may become the curved pattern which is directed to the protruding side to the longitudinal center line Oy.

A straight portion 23e is provided at an intermediate portion between the start end 23c and the end 23d of the cutout 23b, and the straight portion 23e is surrounded by the side end 22c of the upper absorbent core 22. Located between the compression lines 31, this straight portion 23e extends substantially parallel to the longitudinal center line Oy. It is preferable that this straight part 23e is 1/3 or more of the length dimension L of the side end part 22c of the upper absorbent core 22, More preferably, it is 1/2 or more.

In the sanitary napkin 1B shown in FIG. 5, the area where the upper absorbent core 22 is adhesively fixed to the lower absorbent core 21 is the vaginal facing area 25, and the side end portion of the lower absorbent core 21 is formed. The part surrounded by 21c and the notch 23b is the side region 26a.

In this sanitary napkin 1B, since the notch 23b has a protruding curve shape, the side region 26a is easily deformed to follow the thigh shape with the notch 23b as a boundary. Further, the notch 23b has a straight portion 23e, and since the straight portion 23e is sandwiched between the side end portion 22c of the upper absorbent core 22 and the outer compression line 31, the straight portion 23b. With 23e as a boundary, the side region 26a becomes easy to bend.

FIG. 6: shows the sanitary napkin 101 of 2nd Embodiment of this invention, and is a perspective top view which mainly shows the liquid absorption layer similarly to FIG.

In the sanitary napkin 101 shown in FIG. 6, the structure of the liquid absorbing layer 120 is different from the sanitary napkin 1 shown in FIGS. 1 to 3.

The liquid absorbing layer 120 has a lower absorbent core 121 and an upper absorbent core 22. The lower layer absorbent core 121 is formed of an absorbent sheet (airlaid pulp) to which hydrophilic fibers are bonded with a binder, similarly to the lower layer absorbent core 21 of the first embodiment, and its planar appearance is also the lower layer absorbent core 21. Same as). The upper absorbent core 22 is the same as that provided in the sanitary napkin 1 of the first embodiment, and the upper absorbent core 22 is adhesively fixed on the lower absorbent core 121, and the part thereof is the vaginal facing area 25. )

Although the cutout part 123 is formed in the lower absorbent core 121, the pattern of this cutout part 123 is the same as the cutout part 23b of the sanitary napkin 1B shown in FIG. That is, it is a curved pattern toward the protruding side to the longitudinal center line (Oy), and the straight part in the middle is located in the middle between the side end part 22c of the upper absorbent core 22 and the outer compression line 31. The area surrounded by the cutout 123 is the side area 126.

In the side region 126, a soft nitriding treatment for soft-nitrating the lower absorbent core 121 is performed. In the embodiment shown in FIG. 6, in the side region 126, a plurality of cutouts 124 are formed in the lower absorbent core 121. This notch 124 is cut | disconnected so that the lower layer absorbent core 121 may penetrate in the thickness direction, and each notch 124 has the shape which a straight cut line cross | intersects. Similar to the cutouts 23, 23a, 23b, and 123 provided in the folded boundary 29, the cutout 124 for the soft nitriding treatment may be a cutout of the lower absorbent core 121 to the middle of the thickness. .

Note that the cutouts 124 are not limited to the intersecting pattern shapes as shown in FIG. 6, but may be arranged in a plurality of short cutouts extending in a straight line in the longitudinal direction. Alternatively, a plurality of small holes, such as a circular cross section, may be cut out to penetrate the lower absorbent core 121 or penetrate to the middle of the thickness.

When the side region 126 of the liquid absorbing layer 120 is soft-nitredized, the lower layer absorbent core 121 tends to deform in the side region 126.

Therefore, in the form (i) during the mounting shown in FIG. 13, when the force from the thigh portion 42 is received from the transverse direction, the side region 126 tends to be deformed, and the vaginal facing region 25 is deformed. It is easier to prevent that. In addition, in the mounting state (ii) shown in FIG. 13, when an external force acts on the sanitary napkin 101, the side region 126 tends to deform, and the deformation force does not reach the vaginal facing region 25 very well. It is easy to maintain close contact between the vaginal facing area 25 and the vaginal inlet. In addition, since the flexible side region 126 is easily deformed and closely adhered to the shape of the groin 41 and the thigh portion 42, the menstrual blood flowing in the side region 126 can be easily captured by the lower absorbent core 121.

Moreover, also in the sanitary napkin 1 shown in FIGS. 1-3 and the sanitary napkin 1A shown in FIG. 4, it is possible to perform the said soft-nitridation process to a side area | region.

FIG. 7: shows the sanitary napkin 201 of 3rd Embodiment of this invention, and is a perspective top view which mainly shows the liquid absorption layer similarly to FIG. FIG. 8 is a cross-sectional view of the sanitary napkin 201 shown in FIG. 7 taken along the line VIII-VIII.

The liquid absorbing layer 220 of the sanitary napkin 201 is composed of a lower absorbent core 221 and an upper absorbent core 222. The lower absorbent core 221 and the upper absorbent core 222 are similar to the lower absorbent core 21 and the upper absorbent core 22 shown in FIGS. 1 to 3, and the absorbent sheet (airlaid) to which hydrophilic fibers are bonded by a binder Pulp).

As shown in FIG. 7, the upper absorbent core 222 is rectangular and has a straight front end portion 222a, a rear end portion 222b, and side ends 222c and 222c. The width dimension of the upper absorbent core 222 is wider than the upper absorbent core 22 shown in Figs. 1 to 6, and both end portions 222c are located directly above the outer compression line 31, or It is located outside the outer compression line 31. Therefore, as shown in FIG. 8, a part of the outer compression line 31 is formed by compressing the surface sheet 11, the cushion layer 13, the upper absorbent core 222, and the lower absorbent core 221.

In the left and right both sides of the upper absorbent core 222, since the upper absorbent core 222 and the lower absorbent core 221 are compressed together in the outer compression line 31, the upper absorbent core 222 and the lower absorbent core Even if 221 is not bonded, the upper absorbent core 222 and the lower absorbent core 221 are substantially fixed by the outer compression line 31. For this reason, in the vaginal facing area 225, the bending rigidity can be improved similarly to the case where the lower absorbent core and the upper absorbent core are adhesively fixed.

The lower absorbent core 221 is formed with cutouts 223 that form folding boundaries 29 on both the left and right sides. This cutout 223 is a curved pattern directed toward the protruding side on the longitudinal center line Oy similarly to the cutout 23 shown in FIG. 5. The start end 223a and the end 223b of the cutout 223 are located at the side end 221c of the lower absorbent core 221. A straight portion 223c is provided in the middle portion of the cutout portion 223. The straight portion 223c is located outside the outer compression line 31. In addition, the straight portion 223c extends in parallel with the longitudinal center line Oy in the almost entire range of the length dimension of the side end portion 222c of the upper absorbent core 222.

In this sanitary napkin 201, the area where the upper absorbent core 222 is provided is the vaginal immunity 225, and the area surrounded by the side end portions 221c and the cutouts 223 of the lower absorbent core 221 is formed. Side region 226.

Since the lower absorbent core 221 and the upper absorbent core 222 overlap each other, and the outer compression line 31 is formed on both sides of the vaginal facing area 225, the rigidity is locally increased. Since the straight portion 223c of the cutout portion 223 is located just outside the portion where the rigidity is locally set in this manner, the lower absorbent core 221 is the straight portion 223c of the cutout portion 223 due to the difference in rigidity. It becomes easy to bend at the border.

FIG. 9 shows a sanitary napkin 301 of a fourth embodiment of the present invention, and is a perspective plan view mainly showing a liquid absorbing layer similarly to FIG. 2.

The liquid absorbing layer 320 of the sanitary napkin 301 is composed of a lower absorbent core 321 and an upper absorbent core 222. The upper absorbent core 222 is the same as the sanitary napkin 201 shown in FIG. 7. The upper absorbent core 222 overlaps the skin-side surface of the lower absorbent core 321, and outer compression lines 31 are formed at left and right sides of the upper absorbent core 222, and the outer compressive lines 31 are formed. By this, the upper absorbent core 222 and the lower absorbent core 321 are substantially fixed.

The region where the upper absorbent core 222 is provided is the vaginal facing region 325. On the left and right sides of the upper absorbent core 222, the lower absorbent core 321 is subjected to soft nitriding treatment. This soft nitriding treatment is performed by forming a plurality of low density portions 324 in the lower absorbent core 321. The soft nitridation treatment is formed by engaging a roller having a plurality of protrusions (toothed portions) with each other and engaging a portion of the absorbent sheet (airlaid pulp) at room temperature with the engaging portion. By applying a partial tension to the absorbent sheet by the protrusions (dents) and partially lowering the absorbent sheet, the low density portions 324 are formed at a plurality of points corresponding to the arrangement pattern of the protrusions (teeth portions). .

In addition, in the liquid absorbing layer 320 shown in FIG. 9, the notch 223 as shown in FIG. 7 is not formed in the lower absorbent core 321, and the formation area | region of the low-density part 324 which carried out the soft-nitridation process is not formed. The boundary line between the and other regions has a curved pattern directed toward the protruding side to the longitudinal center line Oy.

The sanitary napkin 301 has a high rigidity of the vaginal facing area 325 in which the lower absorbent core 321 and the upper absorbent core 222 overlap, and the rigidity of the side region 326 in which the low density portion 324 is formed. Lowered. For this reason, the position of the vicinity of the side end part 222c of the upper absorbent core 222 becomes a folding boundary part, and the side region 326 becomes easy to bend on the folding boundary part by a rigid difference. In addition, since the side region 326 is soft, the side region 326 can be freely deformed.

In the sanitary napkin 301 of FIG. 9, the notch 124 shown in FIG. 6 may be formed in the side region 326 instead of the low density part 324. In addition, in the embodiment and modified example shown in FIGS. 1-8, the low density part 324 may be formed in a side area, and the side area may be softened.

FIG. 10 shows a sanitary napkin 401 of the fifth embodiment of the present invention, and is a perspective plan view mainly showing a liquid absorbing layer similarly to FIG. 2. FIG. 11: shows sanitary napkin 401A which is a modification of 5th Embodiment, and is a perspective top view which mainly shows a liquid absorption layer similarly to FIG. 12 is a cross-sectional view of the sanitary napkin 401 shown in FIG. 10 taken along the line XII-XII.

10 and 11 do not show the compression line 30 and the upper absorbent core 422, the pattern shape of the compression line 30 is the same as the sanitary napkin 1 shown in FIG.

As shown in FIG. 12, the liquid absorbing layer 420 has a lower absorbent core 421 and an upper absorbent core 422. As shown in Fig. 10, the lower absorbent core 421 has a front end 421a, a rear end 421b, and both side ends 421c and 421c, but its planar shape and size are shown in Figs. It is the same as the lower absorbent core 21 shown. The upper absorbent core 422 has the same dimensions as the upper absorbent core 22 shown in Figs. 1 to 3, and the positional relationship between the upper absorbent core 22 and the outer compression line 31 is also shown in Figs. Same as the sanitary napkin 1 shown in FIG. However, similar to the sanitary napkin 201 illustrated in FIG. 7, both side portions of the upper absorbent core 422 overlap the outer compressive line 31, and the upper absorbent core 422 is disposed on the outer compressive line 31. Both of the lower absorbent core 421 may be compressed.

The lower absorbent core 421 of the sanitary napkin 401 is formed by wrapping pulverized pulp with tissue paper. In other words, unlike the above embodiment, the lower absorbent core 421 is not bonded to the pulp, which is hydrophilic fibers, by a binder. However, superabsorbent polymer (SAP) may be mixed with the pulverized pulp.

As shown in FIG. 10, a plurality of high density portions 423 are formed in the central region of the lower absorbent core 421. The high density portion 423 uses a pin emboss, pressurizes the lower absorbent core 421, and further heats and pressurizes to partially increase the density of the pulp. This high-density portion 423 is formed with almost the same area as the region where the upper absorbent core 422 overlaps. The region in which the high density portions 423 are arranged is the vaginal facing region 425, and the left and right sides of the vaginal facing region 425 are the side regions 426 having no high density portion 423.

In the vaginal facing area 425, the unit weight of the pulp of the lower absorbent core 421 is set larger than the side region 426 of the same lower absorbent core 421. The lower absorbent core 421 has, for example, a unit weight of the vaginal facing area 425 of 200 to 800 g / m ² , and about 50 to 250 g / m ² of the side area 426. In the vaginal facing area 425, the unit weight of the pulp is large and the entire core is compressed to be almost the same thickness as the side area 426, and the high density part 423 is formed. For this reason, the lower absorbent core 421 has a higher rigidity of the vaginal facing area 425 and a lower rigidity at the side regions 426.

The lower absorbent core 421 preferably has a Gurley stiffness of at least 3.92 mN (400 mgf) in the vaginal facing area 425. The difference between the Gulley stiffness of the vaginal facing area 425 and the Gurley stiffness of the side region 426 is preferably 1.96 mN (200 mgf) or more, and more preferably 2.94 mN (300 mgf) or more. The lower limit of the Gurley stiffness value in the side region 426 is not particularly limited, but is preferably about 0.392 mN (40 mgf).

Because of the stiffness difference, the lower absorbent core 421 has a boundary between the vaginal facing area 425 and the side area 426 as the folded boundary 29, and the side region 426 of the lower absorbent core 421 It becomes easy to bend. However, as shown in FIG. 12, in this embodiment, since the outer compression line 31 is provided slightly outside of the vaginal facing area 425 in which the high density portion 423 is formed, the lower absorbent core 421 is provided. The position of the outer compression line 31 becomes the folding boundary 29.

As shown in FIG. 10, the lower absorbent core 421 is an anterior region 427 ahead of the vaginal facing area 425 and the side area 426, and is less than the vaginal facing area 425 and the side area 426. The rear is the rear region 428. In the front region 427 and the rear region 428, the unit weight of the lower absorbent core 421 is equal to the side region 426. The lower absorbent core 421 is partially compressed in the front region 427 and the rear region 428, and the rigidity is set higher than that of the side region 426. In the example shown in FIG. 10, in the front region 427 and the rear region 428, the lower absorbent core 421 is compressed by an intersecting emboss pattern.

The upper absorbent core 422, like the lower absorbent core 421, is wrapped with pulverized pulp with tissue paper, or with pulverized pulp and SAP wrapped with tissue paper. The upper absorbent core 422 and the lower absorbent core 421 may or may not be bonded to each other, but may be bonded to each other.

In addition, as the lower absorbent core 421, the ground pulp is wrapped with tissue paper to form a uniform unit weight, and the ground pulp, the superabsorbent polymer (SAP), and the ethylene vinyl acetate copolymer are formed only in the vaginal facing area 425. The absorbent sheet (airlaid pulp) composed of a binder such as the above may be superposed, and the high density portion 423 may be formed by a pin embossing or the like. On the contrary, the lower absorbent core 421 having a uniform unit weight is formed of the absorbent sheet (airlaid pulp), and in the vaginal facing area 425, the pulverized pulp layer is superposed on the absorbent sheet to form the high density portion 423. May be formed. In addition, the pulverized pulp layer and the absorbent sheet (airlaid pulp) may further overlap the vaginal facing area 425 to form a high density portion.

In addition, at least a lower layer formed of the absorbent sheet (airlaid pulp) is used as the upper absorbent core 422, and the upper absorbent core 422 is fixed to the lower absorbent core 421 by adhesive bonding. ) May further increase the rigidity.

This sanitary napkin 401 is a folding boundary 29 in which the side region 426 is located at the boundary of the vaginal facing region 425 in the state (i) or the mounting form (ii) during the mounting shown in FIG. 13. It becomes easy to bend at the boundary. In addition, the vaginal facing area 425 is hardly deformed and is easily in close contact with the vaginal inlet. In addition, in the front region 427 and the rear region 428, since the rigidity of the lower absorbent core 421 is increased, the front region 427 and the rear region 428 are not inadvertently bent or wrinkled, It becomes close to.

The sanitary napkin 401A shown in FIG. 11 has the same structure as the sanitary napkin 401 shown in FIG. 10, but the boundary line between the side region 426a and the front region 427a protrudes from the longitudinal center line Oy. It is curved toward the side, and the boundary line between the side region 426a and the rear region 428a is also curved toward the protruding side on the longitudinal center line Oy.

In this sanitary napkin 401A, the side region 426a follows the shape of the thigh portion 42, so that it is easy to deform.

In addition, in the sanitary napkin shown in FIGS. 10-12, the cutout part 29 of the lower absorbent core 421 forms a cutout part or a low density part in the folding boundary part 29 of the boundary of a vaginal facing area and a side area, and the side area is bent. You can do it easily.

Moreover, in each said embodiment and modification, you may provide the three-dimensional gathers extended in parallel with the longitudinal center line (Oy) in the side region of the left and right both sides of the skin-side surface of the sanitary napkin. This three-dimensional gather is formed of a sheet such as a nonwoven fabric and an elastic member that exerts an elastic shrinking force between the front end and the rear end of the three-dimensional gather. When a sanitary napkin is curved, a three-dimensional gather rises from the skin side surface

In the mounting form (ii) shown in FIG. 13, the vaginal facing area with high rigidity does not deform well so that its width dimension is reduced. For this reason, the three-dimensional gathers are kept in the state located on the left and right outer side of the vaginal facing area, and the three-dimensional gathers do not move well to the surface side of the vaginal facing area. Therefore, the liquid can be accommodated in the entire surface of the vaginal facing area, and it is easy to prevent the menstrual blood from leaking laterally by the three-dimensional gathers located on both the left and right sides.

Example

(1) Example and Comparative Example

As examples and comparative examples, as the liquid absorbing layer having the shapes shown in Figs. 1 and 2, the lower absorbent core has a length dimension of 210 mm and a width dimension of 75 mm, and the upper absorbent core has a length dimension of 80 mm and a width. One having a dimension of 35 mm was used. Both the lower absorbent core and the upper absorbent core used a pulverized pulp and an absorbent sheet (airlaid pulp) having a weight ratio of an emulsion (binder) of SAP and an ethylene vinyl acetate copolymer of 60:26:14. The upper absorbent core was placed on the longitudinal centerline of the lower absorbent core and adhesively fixed with a hot melt adhesive.

In Example 5 and Example 7, as shown in FIG. 2, the notch 23 extended to the full length of the longitudinal dimension of an upper layer core was formed in the vicinity of the side end part of an upper layer absorbent core. This cutout portion was formed so as to penetrate the lower absorbent core in the thickness direction and extend in a broken line parallel to the longitudinal centerline. In the other examples and comparative examples, the cutout was not formed.

The absorbent layer was sandwiched between a surface sheet formed of a breathable nonwoven fabric having a unit weight of 40 g / m ² and a back sheet of a polystyrene film having a unit weight of 20 g / m ² , and the surface sheet and the back sheet were sandwiched with a liquid absorbing layer. A sample was formed by adhering with a hot melt adhesive on the outside of the.

The unit weight of the absorbent core in an Example and a comparative example was as follows.

(Example 1)

As the lower absorbent core, ^two absorbent sheets having a unit weight of 160 g / m ² were bonded to each other (total unit weight of 320 g / m ² ). As the upper absorbent core, an absorbent sheet having a unit weight of 160 g / m ² was used.

(Example 2)

As the lower absorbent core, an absorbent sheet having a unit weight of 160 g / m ² and ^two absorbent sheets having a unit weight of 60 g / m ² were bonded to each other (total unit weight of 220 g / m ² ). As the upper absorbent core, an absorbent sheet having a unit weight of 160 g / m ² was used.

(Example 3)

As the lower absorbent core, an absorbent sheet having a unit weight of 160 g / m ² was used. As the upper absorbent core, an absorbent sheet having a unit weight of 160 g / m ² was used.

(Example 4)

As the lower absorbent core, an absorbent sheet having a unit weight of 100 g / m ² was used. As the upper absorbent core, an absorbent sheet having a unit weight of 160 g / m ² was used.

(Example 5)

As the lower absorbent core, an absorbent sheet having a unit weight of 160 g / m ² was used. As the upper absorbent core, an absorbent sheet having a unit weight of 100 g / m ² was used. Cutouts were formed at the folded boundaries.

(Example 6)

As the lower absorbent core, an absorbent sheet having a unit weight of 160 g / m ² was used. As the upper absorbent core, an absorbent sheet having a unit weight of 100 g / m ² was used.

(Example 7)

As the lower absorbent core, an absorbent sheet having a unit weight of 160 g / m ² was used. As the upper absorbent core, an absorbent sheet having a unit weight of 160 g / m ² was used. Cutouts were formed at the folded boundaries.

(Comparative Example 1)

As the lower absorbent core, an absorbent sheet having a unit weight of 160 g / m ² and ^two absorbent sheets having a unit weight of 100 g / m ² were bonded to each other (total unit weight of 260 g / m ² ). It was assumed that no upper absorbent core was provided.

(Comparative Example 2)

As the lower absorbent core, an absorbent sheet having a unit weight of 160 g / m ² and ^two absorbent sheets having a unit weight of 60 g / m ² were bonded to each other (total unit weight of 220 g / m ² ). As the upper absorbent core, an absorbent sheet having a unit weight of 60 g / m ² was used.

(Comparative Example 3)

As the lower absorbent core, an absorbent sheet having a unit weight of 60 g / m ² was used. As the upper absorbent core, an absorbent sheet having a unit weight of 160 g / m ² was used.

(2) Measurement of stiffness

"Galley type softness tester (product number 311)" of Yasuda Precision Instruments Co., Ltd. was used. The measurement sample used what cut | disconnected the liquid absorption layer. The lower layer absorbent core and the upper absorbent core of the unit weight were fixed by adhesive, and the widthwise dimension of the sanitary napkin was 38 mm, the longitudinal dimension was 25 mm, and the direction of 38 mm was measured in the longitudinal direction, This was taken as the flexural stiffness of the vaginal facing area. The lower weight absorbent core having the unit weight was 38 mm in the width direction of the sanitary napkin, 25 mm in the longitudinal direction, and 38 mm in the longitudinal direction, which was defined as the bending rigidity value of the side region. .

In addition, the unit of a measured value is "mgf", The value which converted this to "mN" was described in Table 1. In Table 1, for each of the examples and the comparative examples, the difference between the Gurley stiffness value in the vaginal facing area, the Gurley stiffness value in the side area, and the stiffness value was described.

(3) mounting test

The silicone doll which reproduced the lower body of the woman of Kato Tech Co., Ltd. was used. The doll was set so that the minimum thigh spacing was 35 mm. Each Example or each comparative example was combined with the inner side of the crotch part of the underwear, and the test which wore the underwear to a doll was done.

In the evaluation, when the underwear was raised, the side region of the liquid absorbing layer could be bent downward with the folding boundary as a boundary, and the vaginal facing region mounted almost in parallel with the vaginal inlet site was passed.

The mounting test result of Table 1 performed 10 wear tests, and evaluated that "(circle)" which passed all 10 times was "(circle)", and that which passed 6 to 9 times was "(triangle | delta)" and that the pass was 5 times or less as "x".

Vaginal facing area stiffness (mN) Lateral zone stiffness (nN) Stiffness difference (mN) Mounting test results Example 1 19.8 9.44 10.4 ○ Example 2 11 3.68 7.32 ○ Example 3 9.44 2.38 7.06 ○ Example 4 5.01 0.49 4.57 ○ Example 5 5.01 1.1 3.91 ○ Example 6 5.01 2.38 2.63 ○ Example 7 9.44 1.1 8.34 ○ Comparative Example 1 5.01 5.01 0 × Comparative Example 2 5.16 3.68 1.48 △ Comparative Example 3 3.66 0.49 3.19 ×

In Table 1, it is preferable that the Gurley stiffness of the vaginal facing area is 3.92 mN (400 mgf) or more, and the difference between the Gurley stiffness of the vaginal facing area and the Gurley stiffness of the side area is 1.96 mN (200 mgf) or more. It can be seen that the difference in the stiffness is more preferably 2.94 mN (300 mgf) or more.

The sanitary napkin of the present invention is provided with a vaginal facing area, which is a part that absorbs menstrual blood, mainly facing the vaginal inlet, and a side area located next to the liquid absorbing layer, and is folded at a boundary between the vaginal facing area and the side area. Since the side region is provided, the side region is easily bent at the folding boundary as a boundary. For this reason, the vaginal facing area does not bend excessively and faces the vaginal inlet in an easy-to-deploy state, and the adhesion between the vaginal facing area and the vaginal inlet can be enhanced. In addition, since the side region is easily bent at the boundary of the folding boundary, the side region tends to be in close contact with the groin and thigh, and it is easy to prevent the menstrual blood from leaking to the side of the sanitary napkin.

Claims (18)

In the sanitary napkin having a liquid permeable surface sheet, a back sheet, and a liquid absorbing layer located between the surface sheet and the back sheet, The liquid absorbing layer is provided with a vaginal facing area of a predetermined area located on a longitudinal center line, and side regions located on both left and right sides of the vaginal facing area, The liquid absorbing layer has a thickness dimension of the vaginal facing area larger than that of the side area, and a bending rigidity of the vaginal facing area is set higher than that of the side area. A sanitary napkin characterized in that the boundary between the vaginal facing area and the side area is a folding boundary. The liquid absorbing layer according to claim 1, wherein the liquid absorbing layer has a lower absorbent core and an upper absorbent core having a smaller area than the lower absorbent core, and in the vaginal facing area, the upper absorbent core overlaps and is fixed to the skin side surface of the lower absorbent core. The sanitary napkin where the lower absorbent core is located in the side region. The sanitary napkin according to claim 2, wherein the upper absorbent core and the lower absorbent core are adhesively fixed. The physiology of claim 2, wherein compression portions obtained by compressing the upper absorbent core and the lower absorbent core together are provided on both sides of the upper absorbent core, and the upper absorbent core and the lower absorbent core are fixed to each other by the compressive unit. Napkin. The sanitary napkin according to any one of claims 1 to 4, wherein the lower absorbent core and the upper absorbent core are formed of an absorbent sheet to which hydrophilic fibers are bonded by a binder. The liquid absorbing layer according to any one of claims 1 to 4, wherein the liquid absorbing layer has a lower absorbent core and an upper absorbent core having a smaller area than the lower absorbent core, and the upper absorbent layer is disposed on the skin side surface of the lower absorbent core in the vaginal facing area. The absorbent core is overlapped, the lower absorbent core is located in the side region, and in the vaginal facing region, a high density portion which partially compresses the lower absorbent core is formed at a plurality of points. 7. The unit weight of the lower absorbent core in the vaginal facing area is larger than the unit weight of the lower absorbent core in the side area, and the density of the lower absorbent core in the vaginal facing area is lower than the absorbent in the side area. A sanitary napkin that is higher than the density of the core. 7. The liquid absorbing layer according to claim 6, wherein the liquid absorbing layer has a front region and a rear region located forward and rearward than the vaginal facing region and both side regions, and in the front region and the rear region, the bending rigidity of the lower layer absorbent core is the side portion. Sanitary napkin which is set higher than area. The sanitary napkin according to any one of claims 1 to 4, wherein the difference between the Gurley stiffness values in the vaginal facing area and the lateral area is 1.96 mN or more. In the sanitary napkin having a liquid permeable surface sheet, a back sheet, and a liquid absorbing layer located between the surface sheet and the back sheet, The liquid absorbing layer is provided with a vaginal facing area of a predetermined area located on a longitudinal center line, and side regions located on both left and right sides of the vaginal facing area, The liquid absorbing layer has an absorbent core, and the boundary between the vaginal facing area and the side area is a folding boundary, The foldable napkin is provided with a cutout portion that penetrates the absorbent core in the thickness direction or penetrates to the middle thereof, or a low density portion that partially lowers the density of the absorbent core. The sanitary napkin according to claim 10, wherein the folded boundary is located on both left and right sides of the longitudinal center line and is formed parallel to the longitudinal center line. The sanitary napkin according to claim 10, wherein the folded boundary is formed along a curved shape located on both left and right sides of the longitudinal center line and directed toward the protruding side on the longitudinal center line. The sanitary napkin according to any one of claims 10 to 12, wherein the absorbent core is formed of an absorbent sheet to which hydrophilic fibers are bonded by a binder. The sanitary napkin according to any one of claims 10 to 12, wherein an upper layer absorbent core having an area smaller than that of the absorbent core is superposed on the skin-side surface of the absorbent core in the vaginal facing area. The said side area | region is a cutout part which penetrates a lower absorbent core in the thickness direction, or penetrates to the middle, The density of the lower absorbent core of any one of Claims 1-4 and 10-12. The sanitary napkin in which the low-density part which lowered partially was formed in several places. The sanitary napkin according to any one of claims 1 to 4 and 10 to 12, wherein a cushion layer having a lower density than that of the absorbent core is interposed between the liquid absorbing layer and the surface sheet. The concave compression portion compressed from the surface sheet is provided, and the compression portion is located on both left and right sides of the longitudinal center line and is in the longitudinal direction. And a foldable border portion disposed inside the compression portion. The concave compression portion compressed from the surface sheet is provided, and the compression portion is located on both left and right sides of the longitudinal center line and is in the longitudinal direction. And a foldable border portion disposed outside the compression portion.

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